Roll for rolling mills



ROL LLLLLLLLLLLLLLLL s.

APPLICATION FILED DEC.1,919. Q'BEB, Patented Aug. 22, 1922,

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W ATMRNEY grooved or ridged roll, the top portions of the ridges of which are formed of a metal entre srarnsrsnr erica nnnnrrmrm mana canna, or new rome, n, ir,

EUR MLLING MILLS.

miennes;

To'aZZ whom 'it'may concern: Be it known that l, FERDINAND Mo CANDA, Va citizen 'of the United States ot America, and resident of the borough of Manhattan, city, county, and State of New York, have invented a Roll for Rolling 'Mills of which the following is a specication.

My invention relates to rolls tor metal rolling mills and the like, and comprises a which is harder than the body ot the roll or roll-shell, and are held in place by being shrunk on or forced on, and also, preferably, by being Welded to the body ofthe'roll or roll-shell, at their edges.

ln the operation of rollingmills, one .iinf portant feature in the cost of operation is9 the necessity for trueing the rolls. When the rolls require to be maintained in .accurate shape, as, for example, when vaccurate rol l ing to a desired cross-section is required, the necessity for frequent trueing of the rolls adds quite noticeably to the expense, and

moreover causes considerable delay. ln thev case of rolls the ridges of which are required to be quite sharp, Wear of these ridges is particularly undesirable.

lin some cases the roll comprises a shell.

mounted upon a shaft or mandrel; while in other cases the roll is solid. lin the former case the shell must be made of tough steel which cannot be very hard, else it is likely 'to break, and' in the latter case the entire roll must be of tough and, therefore, relatively soft steel. lf the top portions ot the ridges of these rolls may be separately formed, the

durability of the roll as a whole is increased, since it is these top portions which, mainly, are subject to wear; and it they may be removed or replaced, when badly worn, by so doing the roll is practically renewed. But if these top portions of the ridges ma be made of harder metal than the body ot the roll or shell; for example, if these top portions may be formed of hard steel such as tool steel, or even air-hardening steel, then owing to the greater life of such hard portions, as compared with similar portions formed of the same grade of steel as the body ori the roll, obviously the roll need be trued only at relatively infrequent intervals, and its adec- Cfi CJi

tive lite up to the time when the top porgreatly increased.

Specication of )Letters Patent.

'lhe object of m )Patented Aug., 22, i922; Application med December il, 19119- lel'l H0 341,78@

invention is to reduce the wear of ridged ro ls such as referred to, andv therefore to prolong the edective life ofsuch rolls, and to render less frequent the. neces sar trueing thereof.

will now tion with. refperence to the accompanying drawing illustrating various embodiments thereof, and will then point out the novel features in claims: ln said drawings:

to Figure l, numeral l designates a roll-shell mounted upon a shaft or mandrel 2 and dii-ivf ingly connected thereto by means of a hey 3. 4 4 designate rings shrunk on to the shell l and constitutin the top portions of the ridges of the ro l.' las shown, these ridge rings 4l are heldin place not' merely by being shrunk on, provided in vtheir bases with grooves 5 engaged l corresponding shoulders ot the shell. owever, .this mechanicalv engagement of the ridge-rings and the shell is not material to the invention, as the tight grip produced by the shrinking ot the rings 4l on the shell will ordinarily be quite sucient to hold the ridge-rings in place.

0bviously, various constructions whereby these l ridge-rings are interlocked with the roll body may be employed. lin the construction shown in Figure 2 the base et each ridge-ring da has the form ot a very broad il., ith advantage, the union between the body of the roll and the ridge-rings may be increased by welding at the contiguous edges. Figures 3 and 4i illustrate this welding, 6h15 designating strips of metal introduced by a familiar welding operation into notches formed at the contiguous edges of the ridge-rings d", d and shell, and hrmly welded to both the and so uniting the same to one another. So dimly dothese welded-in rings 6 unite the body et the roll to the ridge-ring, that these arts will be held together even should there e, in operation, sufiicient local heating et the ridge-rings to expand them a de- .gree suilicient to neutralize or nearly neu- Figure 1 is a more or less diagrammaticroceed to describe my invenroll embodying my invention, and 'i but also in that they are shell and the rings lil@ are suitable for various purposes, for example are suitable for use in the ball rolling mills shown in my applications for Letters Patent Serial No. 329,774l filed @'ctober v.10, 1919, serial No. 332,284' and @caber 21, 1919, Serial No. 334,030 tiled October 28, Another type of roll to which: my invention is Well adapted is that intended for rolling angle bars, particularly the socalled square root angle bar. Figures 5, 6, 7 and 8 show rolls adapted "for rolling such angle bars the forms of the ridge-rings, here vdesignated by'nunierals 4d, 4E, 4f and 4g, re-

spectively, being such as adapted for that purpose, and the base-forms and Weldingstrip arrangements being as described in connection with previous corresponding iigures.

While the metal ont the ridge-rings may be of the same general character as that of the body of the roll, preferably such rings are formed o' harder steel, for example tool steel or so-called air-hardening or self-hardening steel, or various of the suitable alloy steels. Such hard steel rings will require trueing at relativeiy infrequent intervails only; and when Worn past trueing, or when cracked or chipped or pitted, they may be removed readily and new rings substituted for them., thus producing in effect, a new roll. lit is a simple inatter to. take oit a ring which is held in place by mere shrinking or by a force tit, and it is equally easy to remove rings held in place by Welding. since it is easy to out out the Welding strips.

lit'inay be said that, in a broad or general sense, the shrinking of ridge-tops on a roll body and the forcing by pressure of ridgetops on to roll bodies, are equivalent methods. 1n both vcases the rid e-top rings are held in place by friction. l/ hen in addition they are welded in place, the welded-union supplements the frictional union. 1n the construction vshown in Figures 3 and 7 'the ridge rings may have been appliedfeither by shrinking or by pressure, or by both shrinking and pressure, the Welded unions shown supplementing the frictionai unions thus produced. ln the followingl claim, wherein it is speciied that the top portions of the ridges are held to the roll body by :trictional union, it is intended that both a forceit such as is produced by pressing the rings on vand a tit such as is produced by shrinking the rings on shall be included.

What l claim is: y

A rigid rolling mill roll, comprising a roll body having a series of contiguous grooves or troughs, and rings of harder steel shrunk thereon to constitute the ridges which separate the grooves, said ridge rings having their sides conform to the slope of' the adjacent grooves to thereby form continuations thereof.

in testimony whereof l havel signed this specification in the presence of two subscribing witnesses.

"FERDNAND MURA. CANDA. Witnesses il. M. MARBLE, lizwiN J. STURMWAw. 

